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中文摘要：
基于对混合时间定义的思考,提出了一种新的定义方法,在湍流流场数值计算的基础上通过求解示踪剂的浓度输运方程,研究了单层涡轮桨搅拌槽内的混合过程.结果表明：搅拌转速和搅拌桨安装位置都影响混合时间的大小,而进料位置对混合时间的影响不大.对于不同的搅拌转速而言,随搅拌转速的增大,相同体积分数对应的混合时间逐渐减小.当搅拌桨安装在槽中间位置时所对应的混合时间最小.利用适宜的尺寸和安装位置的导流筒可有效降低混合时间.
英文摘要：
A new definition of mixing time was proposed based on the fraction of well-mixed volume. The mixing process in the stirred tank with a single Rushton turbine was examined by solving the transport equation of the tracer based on the numerical simulation of the whole flow field. It was shown that the value of mixing time was dependent on the speed and position of impeller. Mixing time decreased with the increase of impeller speed at the same volume concentration. When the impeller was in the center of the tank, the mixing time was the shortest. The draft tube with proper dimension and position could effectively decrease mixing time.
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